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Miller Dynasty 400 TIGRunner

Miller Dynasty 400 TIG Welder TIGRunner

Top Features

  • Auto-line Power Management Technology
  • AC and DC TIG Features
  • AC Waveforms
  • Processes: Stick (SMAW), TIG (GTAW), Pulsed TIG, Air Carbon Arc Cutting, Aluminum TIG Welding

Latest technology - powerful, compact AC/DC inverter delivers superior arc performance with total AC arc-shaping capabilities. Auto-Line allows connection to any voltage or frequency in the world while using half the power of a conventional machine.

Product Details


Amperage Range: 3-400 A
Amps Input at Rated Output, 50/60 Hz:
  Rated Output 208V 230V 400V 460V 575V kVA kW
3 Ph: 250A/30V/100% 28   26   14   13   10   10.3   9.8  
300A/32V/60% 36   33   19   16   13   13.1   12.5  
1 Ph: 200A/27.2V/100% 39   35   19   17   13   8.2   7.5  
250A/29V/60% 52   47   26   22   17   10.9   9.9  
Max.Open-Circuit Voltage: 75 VDC
Dimensions: H: 43.125" (1,095 mm) x W: 23.125" (587 mm) x D: 43.75" (1,111 mm)
Net Weight: 251 lb (114 kg)


Stick (SMAW)


Pulsed TIG

Air Carbon Arc Cutting

Aluminum TIG Welding

Additional Features

Allows for any input voltage hookup (208–575 V) with no manual linking, providing convenience in any job setting. Ideal solution for dirty or unreliable power.

Meter calibration
Allows digital meters to be calibrated for certification.

Cooler Power Supply (CPS)
Integrated 120-volt dedicated-use receptacle for the Coolmate 3.5.

Wind Tunnel Technology
Protects internal electrical components from airborne contaminants, extending the product life.

Fan-On-Demand power source
Cooling system operates only when needed, reducing noise, energy use and the amount of contaminants pulled though the machine.

Provides AC or DC arc initiation without the use of high frequency.

Blue Lightning
High-frequency (HF) arc starter for non-contact arc initiation. Provides more consistent arc starts and greater reliability compared to traditional HF arc starters.

Program memory
Features nine independent program memories that maintain/save your parameters.

Adjusts the length of postflow time based on the amperage setting, shielding your tungsten and eliminating the need to set the postflow time.

Industrial Applications
Precision metal fabrication
Heavy fabrication
Pipe and tube fabrication
Aluminum shipbuilding and repair
Anodized aluminum fabrication

Options, Accessories and Related Equipment

Related Equipment

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Miller Dynasty 400 TIGRunner

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Airgas, an Air Liquide company, is the nation's leading single-source supplier of gases, welding and safety products. Known locally nationwide, our distribution network serves more than one million customers of all sizes with a broad offering of top-quality products and unmatched expertise.